Haiyan can now provide you with 15 endurance, and it is the only equipment, so you only need to buy 1 before changing the whole body equipment next time.

For tanks, such as gruer's Aldo Heritage Defender Shield and some T4 breastplates, they are all graded equipment with blue slots. Using sea eye will have 3 points more endurance than conventional sapphire, so why not? If it is jewelry processing, you can also add a meteorite.

Story background (the shadow of Naxxramas)

C 'Thun, an ancient god, is hidden in the depths of Angela's temple. This monster, known as the Thousand-eyed Devil, lurks there like a nightmare. In order to curse the flesh and eat, he frantically lured his worm-draggers into Azeroth. Unfortunately, he finally fell into the hands of the alliance and tribal army under the leadership of Bronze Dragon. The world seems to have once again ushered in a brief peace.

Arthas, the former Prince of Lordaeron and now the Lich King, spent too much time recovering from the fierce battle with Illidan in the frozen throne. Now he is stronger than before. What the Lich King Ner 'Ozu failed to do in those years will be better today, so the Scourge will make a comeback and take the lead.

Arthas' guide and loyal servant Kel 'Thuzad will lead a huge floating war fortress-Naxxramas to visit this familiar and unfamiliar land of Azeroth.